To download the SimCity: Cities of Tomorrow expansion pack, you must first own the base SimCity (2013)
If you purchase a digital code from a retailer like GameStop or Kinguin, follow these steps to download: Download Simcity 5 Cities Of Tomorrow
Conclusion
You cannot download "SimCity 5" and "Cities of Tomorrow" separately as standalone titles. Cities of Tomorrow is an expansion pack. You must first own the base SimCity (2013) game, then add the expansion. To download the SimCity: Cities of Tomorrow expansion
The expansion pack for SimCity (2013) , often referred to as , is called Cities of Tomorrow often referred to as